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Old 08-14-2013, 05:53 AM
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Under valve cover help ... Please

I have decided to change my harnesses out and wanted to ohm out GP's before I button thing up. I put black lead to a good ground and touch each GP with red and get NO readings on any plug.
Does this mean they are good or bad.
It's just strange to me that I get the same no reading on all of them.

Thanks,
Paul
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Old 08-14-2013, 06:03 AM
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Could they really be ALL bad? Doesn't sound reasonable...

You should Not read "0" or "Open", there needs to be a flow to ground within a resistance range. I suspect you're doing something wrong with taking your readings.

Have you read this? -> Troubleshooting GPR & GP's
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Old 08-14-2013, 06:09 AM
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Quote:
Originally Posted by NoRalPh View Post
Could they really be ALL bad? Doesn't sound reasonable...

You should Not read "0" or "Open", there needs to be a flow to ground within a resistance range. I suspect you're doing something wrong with taking your readings.

Have you read this? -> Troubleshooting GPR & GP's
Hi, Yes I did read the guide and thus the reason I removed the V C's. I had no readings through the connector and now none on ea GP's. Black on ground to ea. GP shows no continuity
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Old 08-14-2013, 07:28 AM
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Well, I do think it's more likely that something's wrong with how you're doing it then you have 8 completely burned-out plugs (maybe, but unlikely)

So, what are you using to measure resistance?

What range is it set on?

Have you tried measuring resistance in other things? (even the injectors should show resistance) How about a bulb? You touch the meters probes together and what do you get?
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Old 08-14-2013, 08:00 AM
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Quote:
Originally Posted by NoRalPh View Post
Well, I do think it's more likely that something's wrong with how you're doing it then you have 8 completely burned-out plugs (maybe, but unlikely)

So, what are you using to measure resistance?

What range is it set on?

Have you tried measuring resistance in other things? (even the injectors should show resistance) How about a bulb? You touch the meters probes together and what do you get?
Yes I am asking because I'm not sure if I'm doing it right. I'm using a digital meter. Lowest rating is 200 ohms
On the injectors I can get readings using the common leg and each cyl. I do that through the harness. But the GP I'm supposed to find a good ground and check ?? I touch the meter probes together and get beeping and zero's out.
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Old 08-14-2013, 09:33 AM
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To make sure the ground you're using is good test between it and the closest battery. If its still 0 find a new ground.
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Old 08-14-2013, 01:48 PM
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Still reading ZERO. Tested with a test light and got nothing? Light comes on if I bump anything else on the head, just not the glow plug. Does this mean they are all dead? Sorry guys I'm new at this stuff and can't afford to take it to a shop

Last edited by PaulinFL; 08-14-2013 at 02:01 PM. Reason: ad
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